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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.26 Boeing Proprietary
Entry of a "0" value causes the FMC to compute ETA and fuel predictions for a
constant cruise altitude.
Used for calculation of optimum step point and step climb predictions.
Deletion of a manual entry defaults back to ICAO.
When the cruise climb start point is the next VNAV event, the line title changes to
TO STEP CLIMB.
Displays the ETA and DTG to the point where the step climb starts.
If the airplane passes the step climb point and has not started to climb, the ETA
and DTG are replaced with the word NOW.
When the FMC calculates a step climb is not advised, the ETA and DTG are
replaced with the word NONE.
An altitude can be entered for a step climb evaluation. The FMC calculates the
predicted step climb data and displays the results on this page and the PROGRESS
page.
Entering a zero value for STEP SIZE causes the FMC to calculate performance
based on a constant altitude flight at the CRZ ALT. Entering a valid, non–zero
increment or ICAO step size causes the FMC to calculate performance based on
accomplishing step climbs at calculated step climb points.
Step climb altitudes entered on the RTE LEGS page can be higher or lower than
the CRZ ALT. These step climb altitudes cannot be overwritten on the CRZ page.
When using the ICAO step size, the STEP TO altitude is the next higher altitude
above the OPT altitude corresponding to the direction of flight, based on the CRZ
ALT entered before takeoff. Changes to CRZ ALT while in flight do not affect
calculation of STEP TO altitudes using ICAO step sizes. However, if an alternate
route (for example, Route 2) is activated in flight, the hemispheric altitude will be
calculated using the current CRZ ALT.
When using an altitude increment step size, the STEP TO altitude is the next
higher altitude above OPT calculated by adding the STEP SIZE increment to the
FMC CRZ ALT.
When entering a cruise altitude above maximum altitude, the CDU help window
message MAX ALT FLXXX displays.
Entry of a new cruise altitude deletes all waypoint altitude constraints at or above
the new cruise altitude.
Displays:
• the STEP TO altitude from the RTE LEGS page
• a calculated step climb altitude based on the step size.
2 TO STEP CLIMB
3 STEP TO
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
Boeing Proprietary 11.42.27
Manual entry is allowed.
Blank when:
• there is no active flight plan, or
• within 200 nm of the T/D point, or
• within 500 nm of the destination, or
• in the EO D/D phase.
Displays the ETA and DTG to the step climb point where a climb to the STEP TO
altitude minimizes trip cost (ECON CRZ) or fuel (other CRZ speed).
Displays NOW passing the step climb point.
Displays NONE if planned step cannot be accomplished.
Line title changes to AVAIL AT when the climb is restricted by thrust or buffet.
Line title changes to TO T/D when within 200 nm of the top of descent or within
500 nm of the destination. ETA and DTG are relative to the T/D point.
The data is the same as displayed on the PROGRESS page.
Blank when RTA is active.
OPT –
• with ECON speed selected, displays altitude which minimizes trip cost
based on weight and cost index
• with LRC, EO, CO, or SEL speed selected, displays altitude which
minimizes trip fuel based on weight
• does not reflect the effect of speed if speed intervention (MCP
IAS/MACH window) is selected.
MAX – displays maximum sustainable altitude based on:
• current gross weight
• temperature
• number of engines operating
• cruise reference thrust limit default set by airline (CRZ or CLB)
• speed (ECON, LRC, SEL, EO, or CO) option
• residual rate of climb default set by airline (range: 100 to 999 feet per
minute)
• disregarding altitude or speed constraints
• does not reflect the effect of speed if speed intervention (MCP
IAS/MACH window) is selected.
4 AT
5 Optimum Altitude, Maximum Altitude, and Recommended Altitude
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.28 Boeing Proprietary
RECMD – displays the most economical altitude to fly for the next 500 nm based
on gross weight; selected cruise speed, including specified cruise speed segments;
and constant altitude cruise over a fixed distance taking into account the route of
flight, entered winds, and temperature forecast. The FMC evaluates altitudes up
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787机组操作手册Flight Crew Operations Manual 3(69)
